global gnabar gkbar Vna Vk Vl Inp BCL 
gnabar = 120.;
gkbar = 36;
Vna = 115;
Vk = -12;
Vl = 10.5988;


L = 2; % length of the domain 
d = .0001; % diffusion coefficient
dt = 0.25;
tstep = .1;
rn0 = 0.8;
